:root {
            --primary-dark: #0a192f;
            --primary-medium: #112240;
            --primary-light: #233554;
            --accent-yellow: #FFD700;
            --accent-yellow-light: #FFEB3B;
            --text-white: #e6f1ff;
            --text-gray: #8892b0;
            --text-light: #ccd6f6;
            --transition: all 0.5s cubic-bezier(0.165, 0.84, 0.44, 1);
            --shadow-sm: 0 5px 15px rgba(0, 0, 0, 0.2);
            --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.3);
            --border-radius: 8px;
            --glass-bg: rgba(17, 34, 64, 0.7);
            --glass-border: rgba(255, 215, 0, 0.1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Poppins', sans-serif;
            background: var(--primary-dark);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
            background-image: 
                radial-gradient(circle at 10% 20%, rgba(255, 215, 0, 0.05) 0%, transparent 20%),
                radial-gradient(circle at 90% 80%, rgba(255, 215, 0, 0.05) 0%, transparent 20%);
        }

        h1, h2, h3, h4 {
            font-weight: 600;
            line-height: 1.1;
            margin-bottom: 1.5rem;
        }

        h1 {
            font-size: clamp(3rem, 6vw, 5rem);
            text-shadow: 0 0 15px rgba(255, 215, 0, 0.3);
        }

        h2 {
            font-size: clamp(2rem, 4vw, 3rem);
            position: relative;
            display: inline-block;
            margin-bottom: 3rem;
        }

        h2::after {
            content: '';
            position: absolute;
            bottom: -15px;
            left: 0;
            width: 70px;
            height: 5px;
            background: var(--accent-yellow);
            border-radius: 3px;
        }

        section {
            padding: 120px 10%;
            position: relative;
            min-height: 100vh;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .btn {
            display: inline-block;
            padding: 15px 35px;
            background: transparent;
            color: var(--accent-yellow);
            border: 2px solid var(--accent-yellow);
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: 500;
            text-decoration: none;
            cursor: pointer;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
            z-index: 1;
            text-transform: uppercase;
            letter-spacing: 1px;
            font-weight: 600;
        }

        .btn:hover {
            color: var(--primary-dark);
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(255, 215, 0, 0.2);
        }

        .btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 0%;
            height: 100%;
            background: var(--accent-yellow);
            z-index: -1;
            transition: var(--transition);
        }

        .btn:hover::before {
            width: 100%;
        }

        .section-title {
            display: flex;
            align-items: center;
            margin-bottom: 4rem;
        }

        .section-title h2 {
            margin-bottom: 0;
            margin-right: 30px;
        }

        .section-title .line {
            flex-grow: 1;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-yellow), transparent);
        }

        /* Header & Navigation */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            padding: 25px 10%;
            transition: var(--transition);
            display: flex;
            justify-content: space-between;
            align-items: center;
            backdrop-filter: blur(10px);
            background: var(--glass-bg);
            border-bottom: 1px solid var(--glass-border);
        }

        header.scrolled {
            padding: 15px 10%;
            box-shadow: var(--shadow-md);
        }

        .logo a {
            color: var(--accent-yellow);
            font-size: 2.2rem;
            font-weight: 700;
            text-decoration: none;
            font-family: 'Roboto Mono', monospace;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo a::after {
            content: 'ACOSTA';
            font-size: 1.2rem;
            color: var(--text-light);
        }

        .nav-links {
            display: flex;
            list-style: none;
        }

        .nav-links li {
            margin-left: 40px;
        }

        .nav-links a {
            color: var(--text-light);
            text-decoration: none;
            font-size: 1rem;
            font-weight: 500;
            padding: 8px 0;
            position: relative;
            transition: var(--transition);
            font-family: 'Roboto Mono', monospace;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-yellow);
            transition: var(--transition);
        }

        .nav-links a:hover {
            color: var(--accent-yellow);
        }

        .nav-links a:hover::after {
            width: 100%;
        }

        .nav-links a.active {
            color: var(--accent-yellow);
        }

        .hamburger {
            display: none;
            cursor: pointer;
            background: transparent;
            border: none;
            color: var(--accent-yellow);
            font-size: 2rem;
            z-index: 1001;
        }

        /* Hero Section */
        #hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            padding-top: 0;
            background: radial-gradient(circle at 50% 50%, rgba(10, 25, 47, 0.8), rgba(10, 25, 47, 1));
        }

        #particles-js {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
        }

        .hero-content {
            max-width: 1000px;
            padding-top: 100px;
            position: relative;
            z-index: 3;
        }

        .hero-subtitle {
            color: var(--accent-yellow);
            font-size: clamp(1.2rem, 3vw, 1.5rem);
            margin-bottom: 20px;
            font-family: 'Roboto Mono', monospace;
            opacity: 0;
            animation: fadeInUp 1s ease forwards;
        }

        .hero-title {
            font-size: clamp(3.5rem, 7vw, 6rem);
            margin-bottom: 25px;
            color: var(--text-light);
            line-height: 1.1;
            opacity: 0;
            animation: fadeInUp 1s ease 0.2s forwards;
        }

        .hero-highlight {
            color: var(--accent-yellow);
            position: relative;
            display: inline-block;
        }

        .hero-highlight::after {
            content: '';
            position: absolute;
            bottom: 5px;
            left: 0;
            width: 100%;
            height: 10px;
            background: rgba(255, 215, 0, 0.2);
            z-index: -1;
        }

        .hero-description {
            color: var(--text-gray);
            font-size: clamp(1.1rem, 2.5vw, 1.3rem);
            max-width: 700px;
            margin-bottom: 40px;
            opacity: 0;
            animation: fadeInUp 1s ease 0.4s forwards;
        }

        .hero-cta {
            margin-top: 40px;
            opacity: 0;
            animation: fadeInUp 1s ease 0.6s forwards;
        }

        /* Floating elements */
        .floating-element {
            position: absolute;
            border-radius: 50%;
            background: rgba(255, 215, 0, 0.1);
            backdrop-filter: blur(5px);
            z-index: 1;
            animation: float 6s ease-in-out infinite;
        }

        .floating-element:nth-child(1) {
            width: 150px;
            height: 150px;
            top: 20%;
            left: 10%;
            animation-delay: 0s;
        }

        .floating-element:nth-child(2) {
            width: 100px;
            height: 100px;
            top: 60%;
            right: 15%;
            animation-delay: 1s;
        }

        .floating-element:nth-child(3) {
            width: 80px;
            height: 80px;
            bottom: 20%;
            left: 20%;
            animation-delay: 2s;
        }

        /* About Section */
        #about {
            background: var(--primary-medium);
            position: relative;
            overflow: hidden;
        }

        .about-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .about-image {
            position: relative;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            transition: var(--transition);
            transform: perspective(1000px) rotateY(-5deg);
            transform-style: preserve-3d;
        }

        .about-image:hover {
            transform: perspective(1000px) rotateY(0deg);
        }

        .about-image img {
            width: 100%;
            display: block;
            transition: var(--transition);
            transform: scale(1.05);
        }

        .about-image:hover img {
            transform: scale(1.1);
        }

        .about-image::after {
            content: '';
            position: absolute;
            top: 20px;
            left: 20px;
            width: 100%;
            height: 100%;
            border: 3px solid var(--accent-yellow);
            border-radius: var(--border-radius);
            z-index: -1;
            transition: var(--transition);
        }

        .about-image:hover::after {
            top: 15px;
            left: 15px;
        }

        .about-text h3 {
            color: var(--text-light);
            margin-bottom: 25px;
            font-size: 2rem;
            position: relative;
        }

        .about-text h3::before {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 60px;
            height: 4px;
            background: var(--accent-yellow);
            border-radius: 2px;
        }

        .about-text p {
            color: var(--text-gray);
            margin-bottom: 25px;
            font-size: 1.2rem;
            line-height: 1.8;
        }

        .skills-tools {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            margin-top: 40px;
        }

        .skills-list, .tools-list {
            list-style: none;
        }

        .skills-list li, .tools-list li {
            margin-bottom: 20px;
            color: var(--text-light);
            font-family: 'Roboto Mono', monospace;
            position: relative;
            padding-left: 35px;
            font-size: 1.1rem;
        }

        .skills-list li::before, .tools-list li::before {
            content: '▹';
            color: var(--accent-yellow);
            position: absolute;
            left: 0;
            font-size: 1.5rem;
        }

        /* Skills Section */
        #skills {
            background: var(--primary-dark);
            position: relative;
            overflow: hidden;
        }

        .skills-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 40px;
            margin-top: 50px;
        }

        .skill-category {
            background: var(--glass-bg);
            padding: 40px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--glass-border);
            backdrop-filter: blur(10px);
            transform: translateY(50px);
            opacity: 0;
        }

        .skill-category.visible {
            transform: translateY(0);
            opacity: 1;
        }

        .skill-category:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-md);
            border-color: var(--accent-yellow);
        }

        .skill-category h3 {
            color: var(--accent-yellow);
            margin-bottom: 25px;
            font-size: 1.8rem;
            display: flex;
            align-items: center;
        }

        .skill-category h3 i {
            margin-right: 20px;
            font-size: 2.2rem;
        }

        .skill-item {
            margin-bottom: 25px;
        }

        .skill-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 12px;
        }

        .skill-name {
            color: var(--text-light);
            font-size: 1.1rem;
            font-weight: 500;
        }

        .skill-percentage {
            color: var(--accent-yellow);
            font-size: 1rem;
            font-weight: 600;
        }

        .skill-bar {
            height: 10px;
            background: rgba(136, 146, 176, 0.2);
            border-radius: 5px;
            overflow: hidden;
        }

        .skill-progress {
            height: 100%;
            background: linear-gradient(90deg, var(--accent-yellow), var(--accent-yellow-light));
            border-radius: 5px;
            position: relative;
            width: 0;
            transition: width 1.5s ease-in-out;
        }

        /* Experience Section */
        #experience {
            background: var(--primary-medium);
            position: relative;
            overflow: hidden;
        }

        .timeline {
            position: relative;
            max-width: 900px;
            margin: 0 auto;
        }

        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background: var(--accent-yellow);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
            border-radius: 10px;
        }

        .timeline-item {
            padding: 30px 50px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
            opacity: 0;
            transform: translateX(-50px);
            transition: all 0.8s ease;
        }

        .timeline-item.visible {
            opacity: 1;
            transform: translateX(0);
        }

        .timeline-item:nth-child(odd) {
            left: 0;
        }

        .timeline-item:nth-child(even) {
            left: 50%;
        }

        .timeline-item::after {
            content: '';
            position: absolute;
            width: 25px;
            height: 25px;
            background: var(--primary-dark);
            border: 4px solid var(--accent-yellow);
            top: 40px;
            border-radius: 50%;
            z-index: 1;
            box-shadow: 0 0 15px var(--accent-yellow);
        }

        .timeline-item:nth-child(odd)::after {
            right: -15px;
        }

        .timeline-item:nth-child(even)::after {
            left: -15px;
        }

        .timeline-content {
            padding: 40px;
            background: var(--glass-bg);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--glass-border);
            backdrop-filter: blur(10px);
        }

        .timeline-content:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-md);
            border-color: var(--accent-yellow);
        }

        .timeline-date {
            color: var(--accent-yellow);
            font-family: 'Roboto Mono', monospace;
            margin-bottom: 15px;
            font-size: 1.1rem;
            font-weight: 500;
        }

        .timeline-title {
            color: var(--text-light);
            margin-bottom: 20px;
            font-size: 1.5rem;
        }

        .timeline-company {
            color: var(--accent-yellow-light);
            margin-bottom: 20px;
            font-size: 1.3rem;
            font-weight: 500;
        }

        .timeline-description {
            color: var(--text-gray);
            margin-bottom: 20px;
            font-size: 1.1rem;
            line-height: 1.8;
        }

        .timeline-technologies {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 20px;
        }

        .tech-tag {
            background: rgba(255, 215, 0, 0.1);
            color: var(--accent-yellow);
            padding: 8px 20px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-family: 'Roboto Mono', monospace;
            transition: var(--transition);
            border: 1px solid transparent;
        }

        .tech-tag:hover {
            background: rgba(255, 215, 0, 0.2);
            border-color: var(--accent-yellow);
            transform: translateY(-3px);
        }

        /* Projects Section */
        #projects {
            background: var(--primary-dark);
            position: relative;
            overflow: hidden;
        }

        .projects-filter {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 20px;
            margin-bottom: 60px;
        }

        .filter-btn {
            background: transparent;
            border: 2px solid var(--accent-yellow);
            color: var(--accent-yellow);
            padding: 12px 25px;
            border-radius: 50px;
            cursor: pointer;
            transition: var(--transition);
            font-family: 'Roboto Mono', monospace;
            font-size: 1rem;
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .filter-btn.active, .filter-btn:hover {
            background: var(--accent-yellow);
            color: var(--primary-dark);
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(255, 215, 0, 0.2);
        }

        .projects-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
            gap: 40px;
        }

        .project-card {
            background: var(--glass-bg);
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--glass-border);
            backdrop-filter: blur(10px);
            transform: perspective(1000px);
            transform-style: preserve-3d;
            opacity: 0;
            transform: translateY(50px) rotateX(10deg);
        }

        .project-card.visible {
            opacity: 1;
            transform: translateY(0) rotateX(0);
        }

        .project-card:hover {
            transform: translateY(-20px) rotateX(0deg);
            box-shadow: var(--shadow-md);
            border-color: var(--accent-yellow);
        }

        .project-image {
            height: 250px;
            overflow: hidden;
            position: relative;
        }

        .project-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

        .project-card:hover .project-image img {
            transform: scale(1.1);
        }

        .project-content {
            padding: 30px;
        }

        .project-title {
            color: var(--text-light);
            margin-bottom: 20px;
            font-size: 1.6rem;
            position: relative;
            display: inline-block;
        }

        .project-title::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 50px;
            height: 3px;
            background: var(--accent-yellow);
            border-radius: 2px;
        }

        .project-description {
            color: var(--text-gray);
            margin-bottom: 25px;
            min-height: 100px;
            font-size: 1.1rem;
            line-height: 1.7;
        }

        .project-technologies {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-bottom: 25px;
        }

        .project-links {
            display: flex;
            gap: 20px;
        }

        .project-link {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--accent-yellow);
            text-decoration: none;
            font-size: 1.1rem;
            transition: var(--transition);
            font-weight: 500;
        }

        .project-link:hover {
            color: var(--accent-yellow-light);
            transform: translateX(5px);
        }

        /* Contact Section */
        #contact {
            background: var(--primary-medium);
            position: relative;
            overflow: hidden;
        }

        .contact-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .contact-info {
            display: flex;
            flex-direction: column;
            gap: 40px;
        }

        .contact-item {
            display: flex;
            align-items: flex-start;
            gap: 25px;
        }

        .contact-icon {
            background: rgba(255, 215, 0, 0.1);
            width: 70px;
            height: 70px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-yellow);
            font-size: 1.8rem;
            flex-shrink: 0;
            transition: var(--transition);
            border: 1px solid transparent;
        }

        .contact-item:hover .contact-icon {
            background: rgba(255, 215, 0, 0.2);
            border-color: var(--accent-yellow);
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(255, 215, 0, 0.2);
        }

        .contact-details h3 {
            color: var(--text-light);
            margin-bottom: 12px;
            font-size: 1.5rem;
        }

        .contact-details p, .contact-details a {
            color: var(--text-gray);
            text-decoration: none;
            transition: var(--transition);
            font-size: 1.1rem;
        }

        .contact-details a:hover {
            color: var(--accent-yellow);
        }

        .contact-form {
            background: var(--glass-bg);
            padding: 40px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--glass-border);
            backdrop-filter: blur(10px);
            transform: perspective(1000px) rotateY(5deg);
            transition: var(--transition);
        }

        .contact-form:hover {
            transform: perspective(1000px) rotateY(0deg);
        }

        .form-group {
            margin-bottom: 30px;
        }

        .contact-form input,
        .contact-form textarea {
            width: 100%;
            padding: 18px;
            background: transparent;
            border: 1px solid rgba(136, 146, 176, 0.3);
            border-radius: 8px;
            color: var(--text-light);
            font-family: inherit;
            font-size: 1.1rem;
            transition: var(--transition);
        }

        .contact-form input:focus,
        .contact-form textarea:focus {
            outline: none;
            border-color: var(--accent-yellow);
            box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.2);
        }

        .contact-form textarea {
            min-height: 180px;
            resize: vertical;
        }

        .contact-form button {
            width: 100%;
            margin-top: 20px;
        }

        /* Footer */
        footer {
            background: var(--primary-dark);
            padding: 50px 10% 30px;
            text-align: center;
            position: relative;
            border-top: 1px solid var(--glass-border);
        }

        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 30px;
        }

        .social-links {
            display: flex;
            gap: 30px;
        }

        .social-link {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--accent-yellow);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .social-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 0%;
            height: 100%;
            background: var(--accent-yellow);
            z-index: -1;
            transition: var(--transition);
        }

        .social-link:hover {
            color: var(--primary-dark);
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(255, 215, 0, 0.2);
        }

        .social-link:hover::before {
            width: 100%;
        }

        .copyright {
            color: var(--text-gray);
            font-size: 1rem;
            margin-top: 20px;
        }

        .back-to-top {
            position: fixed;
            right: 40px;
            bottom: 40px;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: var(--accent-yellow);
            color: var(--primary-dark);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: var(--shadow-md);
            z-index: 100;
            opacity: 0;
            transform: translateY(20px);
        }

        .back-to-top.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .back-to-top:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 25px rgba(255, 215, 0, 0.3);
        }

        /* Animations */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes float {
            0% {
                transform: translateY(0px);
            }
            50% {
                transform: translateY(-20px);
            }
            100% {
                transform: translateY(0px);
            }
        }

        /* Responsive Design */
        @media (max-width: 1200px) {
            section {
                padding: 100px 7%;
            }
        }

        @media (max-width: 992px) {
            section {
                padding: 80px 5%;
            }
            
            .about-content,
            .contact-container {
                grid-template-columns: 1fr;
            }

            .about-image {
                max-width: 500px;
                margin: 0 auto;
            }
            
            .timeline::after {
                left: 31px;
            }
            
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            
            .timeline-item:nth-child(even) {
                left: 0;
            }
            
            .timeline-item::after {
                left: 21px;
            }

            .projects-grid {
                grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            }
        }

        @media (max-width: 768px) {
            header {
                padding: 20px 5%;
            }
            
            .hamburger {
                display: block;
            }
            
            .nav-links {
                position: fixed;
                top: 0;
                right: -100%;
                width: 280px;
                height: 100vh;
                background: var(--primary-medium);
                flex-direction: column;
                padding: 100px 40px 40px;
                transition: var(--transition);
                box-shadow: -5px 0 25px rgba(0, 0, 0, 0.3);
                z-index: 999;
            }
            
            .nav-links.active {
                right: 0;
            }
            
            .nav-links li {
                margin: 20px 0;
                text-align: left;
            }

            .projects-grid {
                grid-template-columns: 1fr;
            }

            .skills-container {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 576px) {
            .skills-tools {
                grid-template-columns: 1fr;
            }
            
            .skill-category {
                padding: 30px;
            }

            .projects-grid {
                grid-template-columns: 1fr;
            }

            .hero-title {
                font-size: clamp(2.5rem, 7vw, 4rem);
            }
        }